A turtle is a reptile known for its hard shell, which protects its body. Turtles belong to the order Testudines and can be found in various environments, including oceans, rivers, and on land. They are characterized by their slow movement and long lifespan, with some species living for over 100 years. Turtles are cold-blooded animals, meaning their body temperature depends on their surroundings. They primarily eat plants, insects, and small aquatic animals, depending on the species. Turtles play an important role in their ecosystems, helping to maintain healthy habitats by controlling vegetation and serving as prey for larger animals.